摘要
采用瞬态计算方法与滑移网格技术,对4WS型密炼机流场全填充条件与气液两相条件进行对比分析。结果表明,全填充条件下,流场的最大速度以及最大剪切速率均位于转子棱顶位置,压力最大正压位于转子推进区,最大负压出现在背压区,转子棱顶掠过部位具有较高的混合指数,背压区混合指数最低;气液两相条件下,胶料流出两侧密炼室时几乎没有扩散流动,速度与剪切速率最大位置不仅位于转子棱顶,还存在于两侧密炼室内胶料相与空气相交界面处,左右密炼室胶料群内具有较高的混合指数,且没有明显分布规律。
A transient calculation method and a slip grid technique were employed to compare and analyze the full filling condition of flow field and the gas‑liquid two‑phase condition of 4WS mixer.The maximum velocity and shear rate of the flow field were found to be located at the top of the rotor edge in the full filling condition.Meanwhile,the maximum positive and negative pressures were located at the rotor propulsion area and the back pressure area,respectively.There was almost no diffusion flow in the gas‑liquid two‑phase condition when rubber flowed out of the mixing chamber on both sides.The position at maximum velocity and shear rate was not only located at the top of the rotor edge but also at the intersection interface between the rubber phase and air in the mixing chamber on both sides.The mixing index of the rubber group in the left and right mixing Chambers was relatively high.However,there was no obvious distribution law observed.
作者
韩博宏
何延东
HAN Bohong;HE Yandong(School of Mechanical Engineering,Liaoning Shihua University,Fushun 113001,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2021年第3期67-73,共7页
China Plastics
基金
辽宁省自然科学基金项目(2019-ZD-0061)。
关键词
密炼机
气液两相
对比分析
混合指数
剪切速率
internal mixer
gas‑liquid two‑phase
comparative analysis
mixing index
shear rate
